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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61cdc34f328962f11977974c836d300684d3234b881d7af9dcd19d487e8854b5' 
  AND token = 'VFsnmV6BibhWSGoygxLXEC9SWPm7ZCNbH9Y32Od/FdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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