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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d04ec13cbb0291bbd6ffa59b9111ae876bdf9b1ed2e2dd37fa32496545e4352' 
  AND token = 'kr2QseVJsZHnuCLTpiuDxdZbD8tTQ2kXQ9g/JLYLcSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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