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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46be7618fee036619f57b065dc00b06e0c8d1fb0b616de03601b33fee33c3e63' 
  AND token = 'axB83ucK41v5y77ah2HJgtcsgN1TACFoT0aJV017h3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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