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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dc17d055db832ff9ae63139902f43cc3a0cdccecc8cab85275cb5fd5f159f9b' 
  AND token = 'K2DEE+3K2qTNjjqx0WKxVg99GZP7ALSdfeZYF9YfVpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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