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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd059be9b77fb25c234db3bac310d83bf9da3bd508b86bc23e034cf77d85516' 
  AND token = 'Hlbl9kT9G92j2EvkXIJ4USKz4DlNRFlNpyaAx3Ngt7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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