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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e76550c3a0f0efbe0ad1b8d43da1bf73b2c10b2dd159c8cf7d777cb9e8f1d4b' 
  AND token = 'gZeqJt3qEPSc/I1OKuSi+aReeLl8o7kxTRb3KP9brwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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