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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15505a69532b31c7a49404bf8654bfe0bd90fdf8c84a844788b70b2df93e4a53' 
  AND token = 'RfPQMZM0N7VsKcVmHrU6umJ7tHCn+HU5x+8EDF6dKhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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