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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91e5f6c46c1f439fe3cbf22fb7cc2bb25a0048400d2a70abd61d47b6830e588' 
  AND token = 'sitdZINQMBN2EV12k9UWvTUGLvVJ3tLigialDB9W6kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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