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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f217bf24f97a7f5056f4a93d9ba9df36ef049d1b35721a64d8ac1c155906d5ad' 
  AND token = 'SanrmxrcvhrOVQMTw0IOyJ8OJvcZ9/BEZAce/t7HfQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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