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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07fa585ad97f47994bd3d927528c29a4bae848a4b236d5aa409c689a0615659' 
  AND token = 'uF9GxIoylhmR3DiE9pAcqHQl4Kd6T9WloyUnYKmrIEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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