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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f54b12ed54e7162fab4ed356c12a2e19db98c589a661c799c231eb1689a07a2' 
  AND token = 'g5kLAy85U5Vnu+1CqyXrKFqT1Ff+WxmzekjsamnaCe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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