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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59bf73731ef95b1f622f9f22b2111e87252ccd0c87faa4bcbef87e7df03276a' 
  AND token = 'i73z5xUNi/9YYZ9FxWpuxirto0g/ZFR8oQBh85Hc7aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}