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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b1a16c27c6d8291465b714f832e30db948c17a3530e6105b1f2b92c14cd7cb4' 
  AND token = 'x0DymHwS6u/6ecpfBYvwWnu05Y4cxGUmudV9Vvdzazk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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