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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e08479d6ae5048353105419fbe862d5190e530b70cb8ebfd398ffd45ef641f' 
  AND token = 'pNUA6I9yduSfb3Hs8Z6ZJd5Ejci5le5vAm8IbL0Pznk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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