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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '746014599cc36d014be1f99ebc7e76189c4a7b832144a0ffe635412c0b42496a' 
  AND token = 'jZNfn9WNQw2SEOQZ6QLyj+hreT91ErEpnljGrpW3LaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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