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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7bab12cd2264928cbaeeac4e8bb96d1b68d625c5ea36bb26eaf1cd904f5146' 
  AND token = 'aeRn4iqDrj8WbS9PfUlFkpLgYXlUmcLVY+22QXwVNyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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