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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393600f8f17ff7a561b4c84faca648dd6b5f3519dba5d9e55709b944a7f8d985' 
  AND token = '+Z63AnudG7R/1H3bCq0tp6Al3OCK6BxFsZt11tf0psg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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