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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab05c644b48a0fed25c8593c4690f4b7897f8587cad82b91c561a3de2156558' 
  AND token = '0VeaDMirhs6hLazAUNIJYRXvNGeeEtaKcChn9i2/u+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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