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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f031c7ab83a4145b3a9d39ef01b995b79d6fc800cd357d12a7510ad6615984fa' 
  AND token = 'zNtrQusV44U/Ur+zidShf47D5KKURw6oVU45Gu2w1ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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