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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '338239e4fe69254292b8ed9db127a5e43a6bb00bec80bf2a88b93fe4a7a1a919' 
  AND token = 'KAM+niqKESdjJu0NKy1Ezos826C98hJYTTtgjhC27MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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