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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce1273fa87ad3051dfb32dc00cfc6e5ce37f9a5a9919a1479c6b9c6447a3a911' 
  AND token = 'sngmDorLjj6hTTgRnBHMCOhgN8mh/fsMNZpgiLvAJn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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