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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d7d60203674223b4ec735e4a6facfafe6c4ae8e67541a45db5344d71be3fdb' 
  AND token = '/SnTmTFEoB8sWPU1IaOkWSLMu8DYxTp7ZmQTeiejH+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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