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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3bec7ef16ca8f72f9471fb9ecf7c932b8db2bfc98100dde8f3ab61b4498da8' 
  AND token = 'QrjyOo77Ys1mMtXp8NX3ox2lzhiM7E0axVaIA4Z8MKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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