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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eca6f2fcd373adb6d673e170f9e01cb762616d60f32b3d7040880671dbd8f19' 
  AND token = 'blPZPBcbnW5B3Wi8o5Z/+Kp8QJDxR9ahDEDM28FFy64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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