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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4f59a216ae3d5d726edef03c4514906ea17e4a9282abbff862d9baa0edd0ba' 
  AND token = '/PAm0sDS9wIE4sjZf2ZiAqw7YQn0pRLoUdW2ZqOBv1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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