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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113d1e5a54d1eb29f807ec457c80dda5d8e725a6fdfc6df895a08c4df5b81d9d' 
  AND token = 'FZqwleJQC5oWcUH2hIW6axLIH8krQv/SJAxK9Y8Amxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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