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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65a52d150b5c2fa1ee88b20a149a5ebde55e5b1bc21ffcb44e596b5f5af45495' 
  AND token = '7qoVdLnXD2iOXBGub2WaoZOdNFHQl1dugvLwIgqP9n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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