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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82dca39d980b9a44800cb92b034e4e1e0ccc53a2f49c2c724b926a8a928700a9' 
  AND token = 'd1YxyicWhep3dhfImPwOz8MdqDMLXoM6AWb4tGUE4LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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