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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dadeaf15018ca6cc94f5ddb5f982e865accca2ec03cc783cdcb27bdfd40db5a2' 
  AND token = 'KlnD+CWqLzBl/orMmgdUVJ5ITivFt4Uh2Jukbt/X1ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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