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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d600a5128ed925a488a281c8491fe58118a9b5d1b30fb5667a030e9147c2132' 
  AND token = '4MxvzaWv5y40AlLisTPJyTU+nWvgEwOO1e6uA8XHjls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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