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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd46249344f8b8d57cf2f5b2de86d8895261f7a9df473fcc3cf47b40c6f3503db' 
  AND token = '4q8WQcUtLKWqFmoszWKp8MVQZRebKyn5+nA3WJc/bMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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