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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c57887f834d405bfd778ac21977a25c9116c91cd6d0986849b0883374601059' 
  AND token = 'IHnxxH6mUsej8nss7z2qXIdkH0Ce4HQciUktK7Cm/p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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