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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b3e681370f8c8b3ce9483552e89e8fa8f025cea5ecad63882fa74d7413094a' 
  AND token = 'KiXmoRkbf9ndiH29D9t61L8fVwWwanz3rq9ciLFcxDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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