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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16ff6a41073f904c1a2841a32c7e2773482992457d4cc2e2d45496052a707077' 
  AND token = 'WNnBkzzbPxnYHCEp3poxacgvXiSIKD3IR2ubtXm8taU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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