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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d81dfe92a2a7e6e735bf7e9a73e0fca298ede3f54e6424d92569f98940f9d9f' 
  AND token = 'Fr+1xIKfDyQ0hgQSnKe9f/QDkZJNCjRsPzd4lAJ9TCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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