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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0b1fb0a309cda3b5983c1d7f21e45700957896d825ab26aab7820e88a06e67' 
  AND token = 'kWzDdciCaFzBfhSwZA119dp5YsvorK6C4IG6HPOJSAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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