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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e619c36bd13a9b02848919eed96d0e77c4e8704669bfd11b02087fc9ee777d2' 
  AND token = 'oabxravzHInc4pJL6cpSfxZLrMH7eUBB3LcpQR4T8BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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