SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bdc4b96150ba63c592fe919b1f7ce0e8bd6484c320877356981f2a7cc6f5445' 
  AND token = 'zSwoBgCrYujGllwxmHkZ8IWhEPhS35erkeaQK8y4Mt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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