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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8285fa5270ae9f7ae689b414654b0002955b7ebad7f7b239aff7a38b72914d' 
  AND token = 'CCRHRvZ7pXZIais0yQr09KXQXFc2ZRjNTd0XxdSn4uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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