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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67600908ea64becd0a88ae5799c8ef0de5f13ec97a1c94b1485a1daa642020e2' 
  AND token = 'CD0l2nA6QIFKb4N3F09cGO40kJZseNv2XMKnl8lde3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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