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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b0a09b1d43355f41ecf3bfe38dd1fd02e713502bce3b8c18bb5509b6ac61f0f' 
  AND token = 'g4Cje2Vh3mimvhIoexEC3tvNRsqIWM3SSQJc9FnWmGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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