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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd683ff2ac307f8637f9ac4a311cc46322f601d3419b8df744d9e1c4d6fd4de69' 
  AND token = 'sPbmc9BgRkbU7jSv5tslP1iemKaava2v8OYHJrMLUw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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