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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd36e867b8922dccc45b710a50153e568dc881fdc549e1404420d7021f02cf68' 
  AND token = '47zMVrhvyWY0g9s68fnNuwals8QXnOTDudfn+5JRFwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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