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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4647af4f1978baf878e4bd581156ff8263e7e3dfb0dfa9cf7bd0cc366407f001' 
  AND token = 'AsKWT8xNkUv10mYnwad35yGNT537W9bDKXe1JZhBAD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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