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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8351e1f190d341910377fc5c14559bddd3860479e4815e15e4a420086a0ebf' 
  AND token = 'FA9tzrkCR4lE0Z9+bu3TzyyFF7seZ4Xa8IvBf73pYlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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