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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f3d663fc30b65899e1fe8a361cc1a75b9da1fa54af6b16ff5424d8b76e85fd' 
  AND token = 'c7O/9fbLCxZpfqwhAR6vW3m+OIxbpHxmWvbGuZo+kRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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