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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb184e75417118017ad8b8cf4e8e8ceff90930a87f067830f0c7589ae9f01887' 
  AND token = '736hCyHQ4ViSJPjUnc8grFKSSa6gMnI4ZKFirqJgZnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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