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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c61df7495f02ed0a0cb85a9d217da23529655338f75073fa656eb803132abb70' 
  AND token = 'akCHSjktbT70OlhprdAt2cZYrB02fZFFcAwuyCKVZao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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