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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cef1e8f64e72613b4b1b775a782ae055e65d93e616ae3eb5c96b5481e1535b01' 
  AND token = 'tFtvUop7cwiwf4mavQjF/ehh/0S872l+jJFPjw7tJ8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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