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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '834962da9f8e99694b7abfc75b92143357d55b54a574b40bd6c90b62676fde9b' 
  AND token = 'K3njuySPjE5B6eaJxaUWtSjdSRrFn0lKWmfxxYmQ+Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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