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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60f87d7602c508942ae72998739e3a84a3389248cb3b048ad96ee1a6f86ab35' 
  AND token = '5d8Eb0bQZoDi1x+flR48Za5K85axtfsw/+RhPNSNTqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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