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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aafd07cdc6b075b3a60fc77e4a8ad3e42cba6f1721b603daa02fbfd738d1ab0c' 
  AND token = 'BGkiOiQEY4HZduENSjNyxX32Qu8lZ9KbBTQIl9QLnMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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