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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ecc089c80bfa42d963ae7e2c60ed64ae7e3a5485b3a5a1eb0d5c444fea3ab38' 
  AND token = '/dEn/uZ1DsFJnTtIrg42wkztuxIzBzuLdvQ8LBj2mWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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