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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63248d843c70537a69265947cfe7493f2f8a5a0f5bf90ca46d46cba307aad0fc' 
  AND token = 'mEsN5cS6/TOHXFXoHWvJ1tUl/URB9w3b3PV1MY08sIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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