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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e957be4a5ce79dbdda971c82912f1930eaeefb8ef60a53ab524f042d3d027d28' 
  AND token = 'LgPp67B+2fJE2Dnqt2c1pgjGbUoK/nAeJakvXpOMTmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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