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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f719db1ec1300ddd9a867383ed2a1c1eca956ac3548279d768e45ca0c2c99be' 
  AND token = 'WTbEs89CQuH1vjKvhcM14YhIBOVL6fH0eEP7hpy+z5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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