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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '212cdf8c23778535ed7918220b46ed32949b4fb098ce8f27a8e4df9f2b8f63dd' 
  AND token = 'EJzvO+bwLIrVZczV9a9nmDpFi9C2wJLOjTo28XiLLZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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