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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f9507c2a57b19328634aed53e1bd5d60c2f1fcc22e21fa471dd37231416ab28' 
  AND token = 'W4kf6QY4ZPlVswmC7ezoXVm6JPk9Zuq6Bz1CNln4f7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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