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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237813a1b67f768c6d1d22e8ba12e63549bcba5608a158cd7fcb9f7e1ef5177e' 
  AND token = 'KDjceW46oJPcDTFZXLsIoR3Pq4ADVd9WzfwNZ174WSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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