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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfb55ac4e5355c32c196e653a31ce05459d63576ee4eb98e019f7b67725aabfd' 
  AND token = 'vIIOhiCNE55imXKnvHTXy85aVjVpMekiZEnQawFa6n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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