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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26dde1bf35bd26a25e46f66880e3f0640ac7dbc4d50cf717726c7d4de44eaa59' 
  AND token = '+ftEcuewZEOIszY3u88/PA0NyFes3laf4aBk6IfjbjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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