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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2770a6dabc43088cd6ca83c5fd08d74d219224c0433d75e38ff8681a3013d7d3' 
  AND token = 'WRAtPqn7eQHh28Q6CQvDpTpcGrsDszpL75iVT8ddrLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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