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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '774501e93fedb4663195f6d1f85cf562071334b2784a89964aaf113ba683eb27' 
  AND token = 'V5czadUkdixjTum6JH1ItrUc6pdtD+6d89t3CwJS8UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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