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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '072c992f0cef45c8b3620d7b7f00a97d40463208e48204a46f133b575c93e6f5' 
  AND token = 'HKJW5G1LQ0yvcNcY7HcF55tTcx55uUIJM90ckTvZ1vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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