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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3473d5d1818d71ee5a6190328a70e9908cf8c6241f3162ac94611e817f98c765' 
  AND token = 'xFQ6mnxDbBikZ+P2BsEKDzV1y8VU47Jsdu4D6bPte58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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