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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b8d68c96a7ab1c6dff4d4a26491de083c645ff00d645c25971421d9eedd4ad' 
  AND token = '/jCxGWvgcf6C3dRKhgbCy/2QGbvOrYHllWP5swTo6mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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