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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb92ebef951e9e58d0967c5f2fcced56cb589fdfcbbe4c4081edf6c960f832a' 
  AND token = 'CbjNIbWv6DUBrj4alh/exSAJ0XppmMdhkAYiwW/PxfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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