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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb52ce9097a8250b6876704cc3ddd30bb3bab4757f4822d1562361918271909' 
  AND token = 't/kU5PJedbS31xiTUadrteJY/xr070MqCIPWjwY/NFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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