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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f55ed14665446a3ba4ceabef5bcc59b96c929153de6bc857d6b66d16b0cf203e' 
  AND token = 'aNm2qWKoMSr8PMAyCpocuSBZdFd6ZHzL/0ii30xwlE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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