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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b715d8bbbc1eba3cba70cf336114b61791f49fef7f3cb0c226b7dd4a68aeb35' 
  AND token = 'Q3959shbNO44jpIPzMXvbkM3580iDHrrUwqhtxmJEQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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