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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c7f5b0d8a944cc0a3367fc970eeb8a56b034b9be83fb6c463c055945aafe76' 
  AND token = 'iST0KONlRXkUWKjI4cz29UwI18/ptLsllXZPRXwGSl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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